Low oil pressure 200 20V

Bernie Benz b.benz at charter.net
Mon May 5 08:32:21 EDT 2003

Thanks Mike,

If one isn't very careful one can learn something new every day!  I knew
that there was a check valve under one of the pressure senders but have not
been curious enough to investigate why or where in the oiling circuit was.
Lucky for you that the top end can go for some time with min lube, just a
few complaints from the lifters.


> From: "Michael Hopton" <Michael at siliconoptix.com>
> Date: Mon, 5 May 2003 10:20:46 -0400
> To: "Bernie Benz" <b.benz at charter.net>, <SuffolkD at aol.com>
> Cc: "200q20V mailing list" <200q20v at audifans.com>
> Subject: RE: Low oil pressure 200 20V
> When I had the 3B in my car rebuilt I had no oil pressure. In trying
> to find the cause the pump, oil pan and oil filter were all removed
> at least twice. We even tried packing the pump with gease in case
> it was a priming issue. Nothing worked and I was ready to pull
> the engine and send it back to the engine builder, turns out there
> is a spring loaded check valve that holds oil in the head after shut off.
> The valve is located behind the pressure transducers, so you can get
> oil pressure in the bottom end with it stuck closed but no oil reaches
> the head. Pulled the valve and it was gummed up, replaced it and oil
> pressure is fine. It is possible this valve could stick partially open
> limiting flow to the head/sensors, after a while, heat cycles, clean
> oil and pressure from the pump it could start working normally, just a
> thought.
> Cheers, Mike

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